SANFORD – After four days of testimony detailing the witness accounts and forensics in the case against George Zimmerman, an unusual topic stole the show at times on Friday: Combat sports.

The state and defense battled repeatedly on mixed martial arts, the multi-discipline boxing-like sport usually practiced in an octagonal ring, with regard to both Zimmerman and 17-year-old Trayvon Martin.

After two days' testimony by the state's star witness ended Thursday, prosecutors on Friday called the man expected to be the defense's star: John Good, a Zimmerman neighbor who told Sanford police that on the night of the shootinghe'd seen a black man on top of a lighter-skinned man "just throwing down blows on the guy, MMA-style."

On the witness stand, Good said he was watching television in the living room of his Retreat at Twin Lakes townhome when he heard noises outside. He opened his glass sliding door and stepped out onto his porch.

It looked like a "tussle," Good said, adding "I yelled out, 'What's going on?' and 'Stop it,' I believe."

Good said two people were wrestling, in a straddling position — which defense attorney Mark O'Mara acted out on his knees in court, and Good described with MMA terminology: The "ground and pound."

The one on top was wearing dark clothes, he said, and the one on the bottom had lighter skin and was wearing white or red.

Pressed further by O'Mara, Good said he could identify them: "The person who you now know to be Trayvon Martin was on top, correct?" O'Mara asked.

"Correct," Good replied.

"And he was the one who was raining blows down on the person on the bottom, George Zimmerman, right?" O'Mara followed.

Good's response: "That's what it looked like."

However, Good vacillated on two points that could benefit the state. He said he couldn't say with 100 percent certainty who it was calling out for help — though he thought it was Zimmerman. And healso acknowledged that he didn't see the punches connect, he just saw "arm movement going downward."

The MMA-style testimony continued in the afternoon, but this time the Zimmerman team was on the defensive.

Lindzee Folgate, an Altamonte Family Practice physician assistant who treated Zimmerman Feb. 27, 2012, the day after the shooting, was called to testify on his medical records. Reading a medical history taken Aug. 19, 2011, Folgate testified that due to difficulty sleeping, Zimmerman had "started to exercise intensely with MMA."

Another record from Sept. 23, 2011, indicated Zimmerman was in MMA training "three days per week."

Folgate also gave Zimmerman's measurements from the day after the shooting: 5-foot-7.5, 204 pounds. His body mass index rated him obese, she said. The medical records also described Zimmerman, whose mother is Peruvian and who self-identifies as Hispanic, as a white male.

On cross examination, Folgate testified that the cuts, scrapes and bruises to Zimmerman's head could be consistent with having his head slammed into a concrete sidewalk, as Zimmerman says Trayvon did before the shooting.

O'Mara asked: "Stopping the attack was what allowed him to survive it, wouldn't you agree?"

"It could have, yes," she said, though she agreed that was speculation when prosecutor Bernie de la Rionda followed up.

Earlier in the day, Good had testified that though the fight he saw the night of the shooting did move onto the sidewalk, he didn't see Trayvon slamming Zimmerman's head as the Neighborhood Watch volunteer described.

Jurors also heard Friday from the first people to arrive at the scene after the shooting.

The first civilian, Jonathan Manalo, said he was the first person to encounter Zimmerman after the shooting. He looked like he'd been in a fight, Manalo said, so the witness took cell phone pictures of Zimmerman's bloodied head.

While Manalo was on the phone with Zimmerman's wife — at Zimmerman's request — the defendant blurted out a seemingly blunt remark: "Just tell her I shot someone."

However, Zimmerman also told Manalo "I was defending myself and I shot him," the witness testified on cross-examination.

The first Sanford police officer to arrive, Tim Smith, also testified Friday, and said he held Zimmerman at gunpoint and handcuffed him after Zimmerman said he was the one who shot the teen. Zimmerman was compliant and calm, but also bloodied and wet, with grass on his clothes, Smith said.

Both Manalo and another police witness testified that Trayvon's hands were under his body after the shooting. That's an important point for the state, as Zimmerman told police that after the shooting, he climbed on top of the teenager, spread his arms and pinned them to the ground.

Smith testified that Zimmerman said he'd been crying out for help, as the defense claims. Zimmerman had "sort of a confused look on his face," when he said that, Smith said.

The trial resumes Monday morning. Among those who still haven't taken the witness stand in the high profile case are lead Sanford police investigator Christopher Serino, the medical examiner who autopsied the Miami Gardens teen and Trayvon's parents, Tracy Martin and Sybrina Fulton.

Testimony began Monday, after opening statements. Attorneys in the case estimated testimony and evidence would take two to four weeks, and defense attorney Mark O'Mara said Thursday they're on schedule so far.

Evidence photos released by the Fourth Circuit Court State Attorney's Office and the lawyers for George Zimmerman in the shooting death of teen Trayvon Martin. Sanford resident Zimmerman has been charged with second-degree murder in Martin's death. -------------------- Complete Trayvon Martin...